interval {lubridate} | R Documentation |
interval
object.interval creates an Interval-class
object with the specified start and end
dates. If the start date occurs before the end date, the interval will be positive.
Otherwise, it will be negative.
interval(start, end, tzone = attr(start, "tzone")) is.interval(x)
start |
a POSIXt or Date date-time object |
end |
a POSIXt or Date date-time object |
tzone |
a recognized timezone to display the interval in |
x |
an R object |
Intervals are time spans bound by two real date-times. Intervals can be
accurately converted to either period or duration objects using
as.period
, as.duration
. Since an interval is
anchored to a fixed history of time, both the exact number of seconds that passed
and the number of variable length time units that occurred during the interval can be
calculated.
%--%
Creates an interval that covers the range spanned
by two dates. It replaces the
original behavior of lubridate, which created an interval by default whenever
two date-times were subtracted.
an Interval object
interval(ymd(20090201), ymd(20090101)) # 2009-02-01 UTC--2009-01-01 UTC date1 <- as.POSIXct("2009-03-08 01:59:59") date2 <- as.POSIXct("2000-02-29 12:00:00") interval(date2, date1) # 2000-02-29 12:00:00 CST--2009-03-08 01:59:59 CST interval(date1, date2) # 2009-03-08 01:59:59 CST--2000-02-29 12:00:00 CST span <- interval(ymd(20090101), ymd(20090201)) # 2009-01-01 UTC--2009-02-01 UTC is.interval(period(months= 1, days = 15)) # FALSE is.interval(interval(ymd(20090801), ymd(20090809))) # TRUE